6907 Tube characteristics

[Brian Carling]

The 6907 Data Sheet says it can do 750 watts input at 160 mA.

Even at 70-75%  efficiency it will deliver a LOT more than 18 watts!

G.E. probably ran them conservatively and with no fan.

On 25 Feb 2004 at 6:44, Neil McKie wrote:

>
> Brian Carling wrote:
> >
> > FOR SALE
> >
> > One new 811A from Richardson Electronics.
> > New in box for $25.00 plus shipping.
> >
> > Amperex 6907 VHF Dual Beam Tetrodes - Up to 80 watts output.
> > Gold pins. Looks like a 5894 - See spec sheet at:
> > http://www.wps.com/archives/tube-datasheets/Datasheets/Amperex-CC-36
> > 3/6.JPG QTY 8 of these to sell. They are good used pulls. They are
> > routinely removed from service. All have good emission. Most places
> > sell these from $40 to $60 each or more. Will sell these for $12.00
> > each plus shipping.
>
>   In my experience with the 6907's (I have a few here somewhere) the
>  maximum I ever got out one was about 18 watts on the 460 MHz band -
>  in commercial two-way radio service.
>
>
> > EIMAC 4-65A used tube.
> > Good used condition. I might have a socket too - not sure.
> > Tube has been tested for emission.
> > Dealers sell these used for $75.00 to $95.00 each
> > New ones are around $125
> > QTY 1 available for $29.00 plus shipping
>
>   The 4-65 tube is part of the 4-65, 4-125, 4-250, 4-400 and 4-1000
>  family.  Has a directly heated cathode and is comfortable with a 20%
>  filament voltage reduction during standby which makes for longer life
>  of the tube.
>
>   ... snip ...
>
>
> > Pair of 826 Gonset VHF Finals - Emission tested pulls.
> > These are the tubes used in the Gonset VHF linear amplifiers,
> > Models 3063, 3065 and 3067.
> > These tubes are getting very hard to find now.
> > I have a nice looking pair. Lightly used.
> > These typically sell for $40 to $50 each IF you can find them.
> > Will sell the pair for $39.00 plus shipping
>
>   The Gonset VHF Linear was a good but simple design.  It can be
>  improved upon a bit by doing a slight modification to the input -
>  make the input look like a 50 ohm impedance.  We made that
>  modification some years ago and doubled the grid drive.
>
>
> > 3B28 Rectifiers
> > These make a great sub for the 866 in E.F. Johnson Amateur rigs and
> > others. No warm-up and a lovely bright orange glow. QTY 6 available
> > for $6.00 each.
>
>   The 3B28 is also used in many older General Electric and Motorola
>  250 watt base stations.
>
>   73,
>
>   Neil McKie - WA6KLA

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